Large frequency offset estimation and PN (Pseudorandom Noise) mode detection method and system

A mode detection and large frequency offset technology, applied in the direction of multi-frequency code system, etc., can solve the problems of limited frequency offset estimation range, large error, channel sensitivity, etc., and achieve the effect of shortening the acquisition time

Active Publication Date: 2014-03-26
SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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Problems solved by technology

[0009] (1) Use sliding correlation or differential correlation or segmental correlation to resist frequency offset for PN mode detection, and then use the corresponding frequency offset estimation algorithm to remove frequency offset; however, this method is mainly sensitive to channels and will fail in complex channels, and The range of frequenc...

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  • Large frequency offset estimation and PN (Pseudorandom Noise) mode detection method and system
  • Large frequency offset estimation and PN (Pseudorandom Noise) mode detection method and system
  • Large frequency offset estimation and PN (Pseudorandom Noise) mode detection method and system

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Embodiment Construction

[0064] The present invention will be further described below in conjunction with the examples in the accompanying drawings.

[0065] The invention relates to the field of wireless communication data processing, and mainly relates to a large frequency offset estimation and PN mode detection method for a DTMB receiver system. By adopting the method of the invention, the frequency offset estimation range can reach several megabytes, and the robustness is better in different channels. At the same time, during the detection process, the data is stored and fixed, which can increase the clock for static calculation and improve the detection speed. In addition, since the frequency offset estimation and PN mode detection in the receiver system only work in the initial stage of the system, the FFT module, data storage, PN generation and other units mentioned in the method can be released after the detection is completed, and can be used by other Module multiplexing greatly saves the ha...

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Abstract

The invention discloses a large frequency offset estimation and PN (Pseudorandom Noise) mode detection method and system suitable for a DTMB (Digital Terrestrial Multimedia Broadcast) receiver system. The method comprises the following steps: storing a certain number of received data; realizing correlation operation by using FFT/IFFT (Fast Fourier Transform/Inverse Fast Fourier Transform); performing frequency sweeping to obtain a frequency point corresponding to a maximum correlation value and calculating system frequency offset; trying in different PN modes, wherein a PN mode corresponding to the maximum correlation value is a system PN mode; shifting FFT output data and performing frequency sweeping control in an implementation process. A correlator is replaced by using the FFT/IFFT, thereby greatly saving the hardware cost; storage data are operated, thereby increasing the operation speed; moreover, a method combining frequency sweeping and PN mode trial is adopted, thereby eliminating the limits of channels and other factors and realizing independence and high robustness.

Description

technical field [0001] The invention relates to the field of wireless communication data processing, and mainly relates to a large frequency offset estimation and PN mode detection method for a DTMB receiver system. Background technique [0002] Among the digital TV terrestrial, cable, satellite and many other transmission methods, the digital TV transmission system is the most complicated, and has attracted much attention because of its highest technical requirements and wide audience. Of course, the standardization of the ground system is also very important. At present, there are three international standards for terrestrial digital TV broadcast transmission approved by ITU, namely, American Advanced Television Systems Committee (ATSC), European Digital Video Terrestrial Broadcasting (DVB-T) and Japanese Terrestrial Integrated Services Digital Broadcasting (ISDB-T). In 1999, my country set up digital TV research and development and industrialization and established an in...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 俞丽娜薛亚萍郭焕丽柯仙胜
Owner SHANGHAI HIGH DEFINITION DIGITAL TECH IND
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